Process of making pistons.



A. R. PRIBIL.

PROCESS OF MAKING PISTONS.

APPLICATION FILED OCT. 31, 1917.

1,293,916; Patented Feb.11,1919.

H h ll! 5 14122 niioa:

UNITED STATES Parana carton ALEXIS R. PRIBIL, CLEVELAND, OHIU.

PROCESS OF MAKING PISTON S.

Original application filed December 26, 1916, Serial No. 138,956,

81,1917. Serial Ho. 199/523.

To all whom it may concern Be it known that I, ALEXIS It. PnmiL, a. citizen of the United States of America, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented certain new and useful Improvements in Processes of Making Pistons, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to pistons and relates more particularly to divisional matter not claimed, but disclosed in my pending application filed Dec. 26, 1916, Serial No. 138,956.

The object of the present invention is to provide a piston body or shell thatv may be made from flat hot rolled blue annealed open hearth steel or any suitable material that will provide a rigid and durable piston shell or skirt, the fiat stock being given a cylindrical form with the longitudinal edges butt Welded or otherwise joined, and with a head locked in the body or shell by bringing the flat stock to cylindrical form.

A further object of my invention .is to provide a piston formed in the above manner which may have interior reinforcements, and more particularly a novel pin support which will brace the head of the piston and relieve the shell or side wall thereof of any SUEESSBS or strains relative to a connecting r0 'The invention possesses other advantages than those above enumerated, and reference will now be had to the drawing, Wherein- Figure 1 is a longitudinal sectional view of the piston in accordance with my invention;

'Fig. 2 is a view of the inner end of the piston, and

Fig; 3 is a plan of a piece of stock from which the piston body or shell may be formed.

To put myinvention into practice, I take a piece of fiat hot rolled blue annealed open hearth steel or a piece of light and durable metal that may be rolled and shaped to cylindrical form. The piece of fiat metal is designated 1, and I next subject this piece of metal to the action of the rolls, so as to provide the piece of metal with longitudinal raised portions 53-, and 4. also upstanding flanges 5 and The raised portions 3 provide parallc? grooves in the outer face of the Specification of Letters ?atent.

Elvided and this application filed Gcteser piece of metal contiguous to the flange f) the raised portion-2 provides a groove in cent the flange 5. The raised portion 4- punched or st amped to provide outst tubular holders 7 and these ll ilt spaced equidistant from the ends c 1 piece of stock and located relative to c: other so that said holders will be in 052;)" relation when the piece of stock is bro-1a.; to cylindrical form.

The next step in the process of prod a piston is that of providing a head 8- X may be made of a metal. of greater thicnnesu than the piece of stock 1. The head 8 is cut and stamped in circular form with an annular depressed and outwardly extending edge 9, and this annular edge of-the head is adapted to be received between the flange 6 and the outermost raised portion 3 cf the piece of stock 1, when brought to cylindrical form. By placing the edge 9 of the head 8 in the groove 10 formed by the flange 6 and the outermost raised portion 3, the rolled and grooved piece of stock may now be bent about the edge of the head and to cylindrical form, so that the ends of the piece of stock will abut and may be butt Welded or otherwise connected together, thus locking the head 8 in the outer end of the piston body or shell. The tubular holders '4 will then be in diametrically opposed relation and may receive bushings 11 for a pin 12 by which a connecting rod 13. may be articulated with the piston.

The raised portion' l afiords a wide annular groove in the outer wall of the cylindrical piston body or shell, thus providing an annular lubricant pocket for ilOlding a lubricant during the reciprocation of the piston in a cylinder;

The grooves formed by the raised portions 2 and 3 may accommodate. suitable packing rings, and the head 8 may be lt'ii'lforced by a yoke or pin support 14. This yoke or pin support may be made of metal of the same gage as the head 8 or much heavier than said head or the stock from which the piston body or shell is formed. It is preferable to use channel mate ial and provide the ends of the yoke or support with bearings 15 alining with the tubular holders 7 so as to receive the bushings 11 and thus transfer any stresses or strains of the connectingrod 13 through the pin 12 to the yoke or sum'iort 14 instead of to the walls of the hodv or shell. Besides distrilmting, eonip baton strain, The yoke or gain s ttpport provides; radiating meant; for heat, and

light metal to he used for the body or eltirt of the piston.

1;: is; thought that the manner of forming in piston and its utilit will be apparent aunt: further description, and while in the drawing there is illustrated a lnel erred enilitniinient of my invention, it is to he understood that the structural elements are tanseeptihle to such variations and n1odifieatio' eto; fall within the scope of the an' traded eiaims.

What I claim is:

it. A. process of making pistons, consisting of providing a flat iiieee of metal with it 'sed portions to form a flange oir one side of the piece of metal and at one end thereof, and grooves in the other side of the piece of metal, bending the piece of metal to cvlindrieal form and. connecting the control in ed es thereof, and. looking a piston head i M en eaid flange and one of the raised iawhenthe piece of metal brought porn "1' lo irical form.

2. A process of making, a piston, consist mg in providing a piece of .llat metal with grooves and tubular holders, bending the -piece of metal to cylindrical form to hrinp,

the edges thereof together and said tubular holders in opposed relation, and securing a piston head in position by having the piece of metal bent about and on to the edges of said head.

A process of making a piston consisting of rolling and punching a piece of llat stock to provide grooves and tubular hold ers, bending the piece of stock to cylindrical form so as to bring the edges thereof into abutting relation and said tubular holdera in opposed relation, locking a pieton head in position when bending the piece of Stool;v to

cylindrical form, and then securing a pin support to said head with portions therrol alining with. said tubular holders.

In testimonywhereof .l allix my signature in the presence of two witnesses.

ALEXIS R. PRIBIL.

Witnesses MARTIN J. Vixens, E. D. NYKAMP. 

